The first task is to parse each string in the array to get the size of the die and
the number of rolls. This is easy enough using String.split(). By splitting on
the "d" character, we'll get the number of rolls in position 0, and the size
of the die in position 1 or the resulting array.

To get the minimum value, we just assume that the die always comes up one. So, minimum
is just equal to the number of die rolls.

To get the maximum value, we assume that die always comes up with it's largest possible value.
Here, we just multiple the number of rolls by the size of the die.

Then, we compute the average using the formula on line 22.

We these three values calculate, we just create an int[] to hold them, and return it.

Thank you for taking the time to read this solution. I welcome
any feedback you may have.